Page 7 - ICJ-August-2020

editorial

detailing performance in seismic conditions would be a useful sustainability aspects in mining and use of magnetite in various
contribution for a future issue of this journal. applications, including an interesting example of recycling
magnetite from a dismantled offshore platform.
With variable properties, the performance of RCA as a product
depends very much on the source of C&D waste and the The closing article by Bittner (2020) shows the way forward with
processing effort involved. Having said that, it is quite difficult to the upcoming 3D printing (3DP) technology in construction.
capture the variation in properties by existing codes of practice, It argues that an increasing gap in product offering is the
which have a lot of catch up to do. Given this harsh reality, the prime mover for adopting 3DP of concrete structures, as the
authors Engelsen et. al. (2020) have carried out an extensive principles of standardisation, industrialisation, automation,
assessment of the product coming from a large C&D waste and digitalisation, creep into the construction industry from
processing facility in Delhi. This meticulous work involved daily other engineering disciplines. The author makes a business
sampling of a low-grade mixed C&D waste over a 5-month case for 3DP, but nevertheless, reminds the readers that the
period, in a unique location and detailed information on such triage of time, cost and quality could dictate its evolution for
a source is rare to come across. The findings of this study are the foreseeable future. While the lack of coarse aggregates
encouraging, as it recommends use of recycled C&D waste from in 3DP pushes up the quantity of cement mortar required
this processing facility to manufacture recycled products – great and the associated cost, there is also scope for use of finer
for circular economy. fraction of RCA and research is in progress at leading institutes
Moving on, the paper by Girish et. al. (2020) argues for adopting across the world. It must be realised that the vast requirement
self-compacting concrete (SCC) as an effective tool when of conventional concrete usage cannot be pushed away, as
RCA is to be used without processing either due to lack of 3DP has been used judiciously to print lost formwork and
processing facility or if such a facility is not in proximity. The conventional concrete is poured to fill the void. Development
authors suggest SCC for unprocessed RCA, as the high powder of acceptance criteria for 3DP in construction, although not at a
content could possibly overcome deficiencies in the aggregate rapid pace, is a welcome move indeed – useful information for
characteristics. Chen et. al. (2020) detail an application of RCA readers.
in pervious concrete, proving its versatility for use in sustainable We thank all the contributors and the reviewers for their valuable
drainage systems. The paper by Guo et. al. (2020) demonstrates support in enhancing the quality of the publication.
intelligent application of nanotechnology via graphene oxide
to improve the interfacial transition zone properties of concrete Recommend reading all the papers, as I believe the content is
made with RCA. The following paper by Perumal et. al. (2020) useful for further research and relevant for practice as well.
introduces an interesting project “DeConcrete” specific to Happy reading!
the Arctic region countries, that aims to promote greater
co-operation between the various stakeholders and thereby, Sivakumar Kandasami
promote circular economy. Hunt and Moriarty (2020) explain the Guest Editor for the Special Issue, ICJ

REfERENCES
1. Goodier, C., Dodds, W. (2020). “Sustainable and durable - with recycled concrete aggregate?” The Indian Concrete Journal, Vol.
94, No. 8, pp. 7-10.
2. Kshemendra Nath, P., Bhatiani, G. (2020). “Policies and business strategies for C&D waste management in India” The Indian
Concrete Journal, Vol. 94, No. 8, pp. 11-24.
3. Zhao, Y., Zeng, W., Zhang, H. (2020). “Performances and applications of recycled aggregate concrete components in Chinese
Mainland” The Indian Concrete Journal, Vol. 94, No. 7, pp. 25-31.
4. Engelsen, C. J., Malhotra, S.K., Bhatiani, G., Nath, K. (2020). “Detailed assessment of the technical properties of recycled
aggregates from mixed C&D waste” The Indian Concrete Journal, Vol. 94, No. 8, pp. 32-39.
5. Girish, S., Ajay, N., Azimi, S. (2020). “A study on the use of construction and demolition waste as coarse aggregate in self-
compacting concrete for sustainability” The Indian Concrete Journal, Vol. 94, No. 8, pp. 40-50.
6. Chen, S., Zhang, Z., Chen, J., Bie, Y. (2020). “Mechanical properties and permeability of pervious concrete made with recycled
concrete aggregates” The Indian Concrete Journal, Vol. 94, No. 8, pp. 51-57.
7. Guo, K., Yang, F., Zhou J., Liu, M. (2020). “Study on the nano-hardness of the interfacial transition zone of recycled concrete with
graphene oxide” The Indian Concrete Journal, Vol. 94, No. 8, pp. 58-63.
8. Perumal, P., Novakova, I., Danilov, V. (2020). “DeConcrete: Eco-efficient Arctic technologies for construction and demolition
practices” The Indian Concrete Journal, Vol. 94, No. 8, pp. 64-70.
9. Hunt, R., Moriarty, M. (2020). “Sustainability of MagnaDense in Civil Engineering” The Indian Concrete Journal, Vol. 94, No. 7, pp.
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10. Bittner, W. H. (2020). “Brief overview on 3D construction printing” The Indian Concrete Journal, Vol. 94, No. 8, pp. 75-77.

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